<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>other</title>
    <style>
        * {
            font-size: 28px;
        }
    </style>
</head>

<body>
    <button id="btnGet" type="button">取key-1</button>
    <div>
        <div>消息：</div>
        <div id="message"></div>
    </div>
    <script>
        btnGet.onclick = function () {
            message.innerHTML =  `结果: ${sessionStorage.getItem('key-1')}`
        }
    </script>
</body>

</html>